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Method for preparing CoNi-S-coated 3D-C nano composite material and modified battery diaphragm

A nano-composite material, coni-s technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of inability to maintain high-capacity lithium-sulfur batteries, low capacity, volume expansion of transition metal sulfides, etc. problem, to achieve good energy storage effect, high capacity and service life, and the effect of inhibiting volume expansion

Active Publication Date: 2022-06-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the technical problems that the negative electrode material in the prior art will cause the transition metal sulfide volume to expand and the capacity of the general carbon material is not high as the negative electrode material in the process of charging and discharging. Another purpose of the present invention is to solve the traditional Celgard2325 commercial separator cannot maintain the high capacity of lithium-sulfur batteries and meet the safety issues of lithium-sulfur batteries

Method used

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  • Method for preparing CoNi-S-coated 3D-C nano composite material and modified battery diaphragm
  • Method for preparing CoNi-S-coated 3D-C nano composite material and modified battery diaphragm
  • Method for preparing CoNi-S-coated 3D-C nano composite material and modified battery diaphragm

Examples

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Effect test

Embodiment 1

[0027] Example 1: Preparation of CoNi-S@3D-C nanocomposites

[0028] 0.48g cobalt nitrate powder, 0.48g nickel nitrate powder, 0.22g thiourea (CH 4 N 2 S) The powder was dissolved in 70 ml of ethylene glycol solution by ultrasonic stirring, and the ultrasonic stirring was continued for 30 minutes, after which 1.4 g of cetyltrimethylammonium bromide (CATB) powder and 0.422 g of glucose (C 6 H 12 O 6 ) solution, continue to keep ultrasonic stirring for 30 minutes, then transfer the above solution into a stainless steel autoclave, hydrothermally react at 180 ° C for 12 hours, the product is washed 3 times with deionized water and ethanol, and then dried at 80 ° C overnight. The good powder and sulfur powder are mixed in a mass ratio of 1:5 (100 mg of product: 500 mg of sulfur powder), then fully ground, and then placed in a high-temperature resistant porcelain boat, and heated to a temperature of 3 °C / min in a tube furnace. The final product CoNi-S@3D-C was obtained after hol...

Embodiment 2

[0031] Example 2: Preparation of electrodes

[0032] 70 mg of CoNi-S@3D-C powder and 20 mg of acetylene black powder and 10 mg of polyvinylidene fluoride (PVDF) solution were mixed together, and the mixture was dispersed in N-methylpyrrolidone (NMP), triturated with agate The bowl is ground into a uniform slurry, which is then evenly coated on the copper foil. Then the coated copper foil was dried in a vacuum oven at a temperature of 70 °C for 12 hours, and cut into electrodes with a radius of 6 mm, such as image 3 As shown, 3a is the front side of the electrode and 3b is the back side of the electrode.

Embodiment 3

[0033] Example 3: Preparation of Li-ion and Na-ion batteries

[0034] Metal lithium and metal sodium were used as positive electrodes respectively, the electrodes obtained in Example 2 were used as negative electrodes, and Celgard 2325 commercial separators were used to assemble two button batteries, lithium ion batteries and sodium ion batteries, in the glove box. The lithium ion battery was added with 60 microliters The electrolyte used in lithium ion batteries is secondary electrolyte (LB-008); 80 microliters of electrolyte is added for sodium ion batteries, and sodium trifluoromethanesulfonate electrolyte (NS-001) is used in sodium ion batteries. The discharge capacities of the two batteries were measured at current densities of 100, 300, 500, 1000, and 2000 mA / g, respectively, such as Figure 4 (b) and (d), these two figures show that the discharge capacities of Li-ion batteries are 1096, 980, 891, 768 and 618 mAh / g at current densities of 100, 300, 500, 1000, 2000 mA / g, ...

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Abstract

The invention discloses a method for preparing a CoNi-S-coated 3D-C nano composite material and a modified battery diaphragm, the CoNi-S-coated 3D-C nano composite material synthesized by the method is not only suitable for a lithium ion battery, but also suitable for a sodium ion battery, and the CoNi-S-coated 3D-C nano composite material shows a good energy storage effect when being used as a negative electrode of the lithium ion battery and a negative electrode of the sodium ion battery; even if charging and discharging circulation is carried out under high-density current, very stable performance can be maintained, and meanwhile, the material also has very high reversible capacity. The heteroatom-doped three-dimensional nano carbon structure realizes good wrapping of the metal sulfide, and volume expansion of the metal sulfide can be effectively inhibited, so that attenuation of specific capacity of the metal sulfide is slowed down, and high capacity and service life of the negative electrode material are maintained. The CoNi-S-coated 3D-C material can also be used as a diaphragm modified material of the lithium-sulfur battery, and the modified diaphragm can maintain the high energy storage effect of the battery and slow down the capacity fading of the lithium-sulfur battery while improving the safety performance of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of battery electrode materials, in particular to a method for preparing a CoNi-S@3D-C nanocomposite material and a modified battery separator. Background technique [0002] Traditional transition metal sulfides as negative electrodes of lithium ion batteries (LiBs) and sodium ion batteries (SiBs) have problems of low electrical conductivity, large volume expansion rate of transition metal sulfides during charge and discharge, and due to the radius of sodium ions. It is larger than the lithium ion radius, so the anode application of sodium ion battery is more difficult in terms of anode material application. [0003] In the application number CN201610119213.5, the name of the invention is the preparation method of biomass-based hollow carbon micro-tube / nickel-cobalt metal sulfide composite electrode material, using biomass catkin as a carbon source, using inert gas to carbonize at high temperature to generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58
CPCH01M4/362H01M4/525H01M4/5815Y02E60/10
Inventor 王志荣魏亚男汪俊岭
Owner NANJING UNIV OF TECH
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